Nature has shaped this drainage tunnel into the digestive tract of a mighty beast.

Construction uncovered this trove of fossils, which visitors are welcome to add to their own collections.

Red ocher pictographs survive in this tufa rock shelter on the shore of an ancient lake.

You can dig up your own crystals in the quartz capital of the world.

Despite monuments in other locations, this spot in a South Dakota field is recognized by the U.S. National Geodetic Survey as the center of the 50 states.

The last refinements in the North Carolina-South Carolina boundary were marked with this stone.

These strange large stones served as a campsite and lookout post for generations of Native Americans.

These cabins mark the site where our 11th president was born (probably).

A replica of where the Last Supper was held.

The ruins of this once-grand mansion are linked to one of the country’s most popular clothing brands.

During the American Revolutionary War, iron excavated from this mine was used to make swords, cannons, and more.

A royal relic from the time that gambling was accidentally made legal in South Carolina.

This chicken coop pays homage to a classic architectural style made famous throughout the southern United States.

Strange beasts lurking in a garden are all that remain of a quirky, short-lived theme park.

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

This abandoned bridge is now a favorite haunt for graffiti artists.

The abandoned bathhouse is all that remains of the hot springs considered Florida's original tourist attraction.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

This abandoned amusement park was built on a site with a dark history.

Jacksonville's highways rendered this century-old grammar school unusable.

The eerie ruins of a remote abandoned hamlet said to be founded by the survivors of a shipwreck.